qr code generator asp net c# PrincipalPermission Class in C#

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PrincipalPermission Class
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The System.Security.Permissions.PrincipalPermission class and the related PrincipalPermissionAttribute class enable you to check the active principal for both declarative and imperative security actions. They (collectively referred to as PrincipalPermission) are typically used to declaratively demand that users running your code have been authenticated or belong to a specified role. By passing identity information (user name and/or role) to the constructor, PrincipalPermission can be used to demand that the identity of the active principal match this information. You can set any combination of three properties for PrincipalPermission:
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Authenticated A Boolean value. If set to true, the permission requires the user to
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be authenticated.
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Lesson 1: Authenticating and Authorizing Users
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Name A string that must match the identity s user name. Role A string that must match one of the principal s roles.
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Memorize these three properties. Remember, PrincipalPermission doesn t expose any other properties not a user s full name, phone number, password, or any other attribute.
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PrincipalPermission has several methods; however, only the PrincipalPermission .Demand method is used with the RBS techniques described in this chapter. The Demand method verifies that the active principal meets the requirements specified in the Authenticated, Name, and Role properties. If the principal does not match any properties that are not null, the principal throws an exception.
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How to Use Declarative Role-Based Security Demands to Restrict Access to Methods
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Declarative RBS demands instruct the runtime to perform an RBS check before running a method. This is the most secure way to use RBS to restrict access to code because security is enforced by the runtime before it runs your code. There are two primary disadvantages to declarative RBS demands:
They can be used only to restrict access to entire methods. They might result in the runtime throwing an exception. If the method was called by a Windows event, Windows catches the exception, and your application might stop running.
To use declarative RBS demands, you must have three elements in your code:
The System.AppDomain.CurrentDomain.SetPrincipalPolicy method to specify the principal security policy A Try/Catch block to catch underprivileged access attempts and to report the error appropriately A PrincipalPermission attribute to declare the method s access requirements
First, specify the principal policy for the thread from within your application using the System.AppDomain.CurrentDomain.SetPrincipalPolicy method, as described earlier in this lesson. Next, create a Try/Catch block to catch the System.Security.SecurityException exceptions that the runtime will throw when it attempts to run the method but lacks the permission demanded. It s important to catch this type of exception and provide a useful error message to the user because without the error message, the user could quickly become frustrated and might spend a significant amount of time
12
User and Data Security
attempting to troubleshoot the access problem. Additionally, log failed access attempts so that administrators can analyze the events to detect potential compromises. For example, the following code calls a method named AdministratorsOnlyMethod (not shown) that is protected with a declarative RBS demand and displays a message box if the user lacks the necessary permission:
' VB Try AdministratorsOnlyMethod() Catch ex As System.Security.SecurityException MessageBox.Show("Your account lacks permission to that function.") End Try // C# try { AdministratorsOnlyMethod(); } catch (System.Security.SecurityException ex) { MessageBox.Show("Your account lacks permission to that function."); }
Finally, add declarative permission statements using the PrincipalPermission class before each method you need to restrict access to. You must define two things for PrincipalPermission:
The action PrincipalPermission will take using the System.Security.Permissions. SecurityAction enumeration. Typically, you use SecurityAction.Demand for declarative RBS. One or more PrincipalPermission properties. Use Authenticated to restrict access to authenticated users, Role to restrict access by group memberships, and User to restrict access to a specific user name.
For example, the following code (which requires the System.Security.Permissions namespace) causes the runtime to throw a System.Security.SecurityException exception when the user is not a member of the local Administrators group:
' VB <PrincipalPermission(SecurityAction.Demand, Role:="BUILTIN\Administrators")> _ Private Sub AdministratorsOnlyMethod () ' Code that can only be run by Administrators End Sub // C# [PrincipalPermission(SecurityAction.Demand, Role = @"BUILTIN\Administrators")] static void AdministratorsOnlyMethod() { // Code that can only be run by Administrators }
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